在 .h 文件里：
@property (retain, nonatomic) IBOutlet UIButton *btnMyButton;
btnMyButton.enabled = NO; // disable my button btnMyButton.enabled = YES; // enable my button
http://stackoverflow.com/questions/9012100/enable-disable-a-button-in-xcode-4-2
iOS buttonset Enable or Disable
原文：http://www.cnblogs.com/jzdwajue/p/7100184.html